Commit 8e293fb0 authored by Linus Walleij's avatar Linus Walleij
Browse files

gpio: stmpe: implement .get_direction() 



This implements the .get_direction() callback for the STMPE
expander GPIO.

Cc: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 353661df

drivers/gpio/gpio-stmpe.c

+17 −0
Original line number Diff line number Diff line
@@ -68,6 +68,22 @@ static void stmpe_gpio_set(struct gpio_chip *chip, unsigned offset, int val) 
		stmpe_reg_write(stmpe, reg, mask);

}



static int stmpe_gpio_get_direction(struct gpio_chip *chip,

				    unsigned offset)

{

	struct stmpe_gpio *stmpe_gpio = gpiochip_get_data(chip);

	struct stmpe *stmpe = stmpe_gpio->stmpe;

	u8 reg = stmpe->regs[STMPE_IDX_GPDR_LSB] - (offset / 8);

	u8 mask = 1 << (offset % 8);

	int ret;



	ret = stmpe_reg_read(stmpe, reg);

	if (ret < 0)

		return ret;



	return !(ret & mask);

}



static int stmpe_gpio_direction_output(struct gpio_chip *chip,

					 unsigned offset, int val)

{
@@ -106,6 +122,7 @@ static int stmpe_gpio_request(struct gpio_chip *chip, unsigned offset) 
static struct gpio_chip template_chip = {

	.label			= "stmpe",

	.owner			= THIS_MODULE,

	.get_direction		= stmpe_gpio_get_direction,

	.direction_input	= stmpe_gpio_direction_input,

	.get			= stmpe_gpio_get,

	.direction_output	= stmpe_gpio_direction_output,